Chemical Reacti...

A student added zinc granules to copper sulphate solution taken in a test tube. Out of the following, the correct observation (s) made by the student will be
I. zinc granules have no regular shape.
II. Zinc granules have silvery grey colour.
III. The colour of zinc granules changed to brownish black.

When a student added zinc granules to dilute HCl, a colour less and odourless gas was evolved, which was tested with a burning match stick it was observed that

Silver chloride turns grey in sunlight to from silver metal is a

If the solution of lead (II) nitrate and potassium iodide are mixed together. What is the colour of the precipitate obtained?

A solution of substance ‘X’ is used for white washing. Name the substance ‘X’

Match the following with correct response.
(1) Oxidation
(2) Reduction
(3) Reducing agent
(4) Oxidising agent

(A) Gain of electron
(B) Electron accepting species
(C) Electron losing species
(D) Loss of electron

Match the following with correct response.
(1) Chemical change
(2) Physical change
(3) Exothermic
(4) Endothermic

(A) Energy releasing
(B) Rusting of iron
(C) Energy absorbed
(D) Dissolution of sugar or salt in water

Match the following with correct response.
(1) Gain of hydrogen
(2) Loss of hydrogen
(3) Unpleasant taste and foul small in fatty food
(4) Eating away of metal in the presence of air and moisture

(A) Reduction
(B) Rancidity
(C) Oxidation
(D) Corrosion

Match the following with correct response.
(1) Evolution of gas
(2) Mass of reactant is equal to mass of products
(3) Increase in temperature
(4) Pop sound

(A) conservation of mass
(B) Evolution of Hydrogen gas
(C) Exothermic change
(D) Chemical change